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The .20-250 an extreme predator rifle

by Dave Affleck

Load Work and Load Data
I’ve kept load work for this rifle to a minimum.  I really don’t know how many rounds the barrel is going to last, and the rifle wasn’t built for shooting paper anyway.  So I just don’t want to shoot at paper with it any more than I really have to.  Basically, all I’ve done is to take each bullet I’ve wanted to try, and worked up to maximum with a couple of different powders for each bullet.  For much of the initial working up to maximum process, I used only a single shot at each load increment.  Most of the groups I’ve shot have been three shot groups only.  My goals during load work for this rig are simple.  As far as accuracy goes, anything in the neighborhood of ½ inch, three shot groups is “good enough”.  Anything over about .625 at 100 yards is “not good enough”.  Most of the bullet and powder combinations I’ve tried have shot ½ inch groups or better, some of them have been ¼ inch.  Of course I also had some velocities in mind that I was hoping to see.  The velocities I’m actually getting, are just a hair lower than I was hoping for, but not by much (my bet is on barrel length as the reason).  Over all, I’m satisfied with the accuracy and velocity performance I’m seeing.  Below is some of the data from my load work with my .20-250.

Please note!  As with any individual load data, these loads should be approached with caution.  This is ESPECIALLY true of ANY data you find on the internet from an individual such as myself.  Heck, for all you know, this data isn’t even safe in MY rifle, let alone yours!

All loads are with the bullet in firm contact with the lands (“square marks”) and using Fed. 210 primers.

.20-250, Lilja 12 twist            
             
Bullet Date Powder Charge OAL Velocity Group Notes
45 Hornady 11/26/2006 N560 40.5 " 3984 0.540 Max.
11/22/2006   39.5 3.030 3890 0.460 Good accuracy.
"   39.0 " 3851 0.650 Mild
             
11/21/2006 N550 37.0 3.030 4033 0.815 2 shots, quite windy, MAX!
             
11/10/2006 Big Game 37.5 3.030 4113 0.850 Max., accuracy so-so, try 37.0
11/26/2006   37.0 3.030 4027 0.575 Probably best so far w/45 Horn.
11/10/2006   36.5 3.030 3986 0.740 Best group of day w/45 Hornady
             
             
40 Berger 11/21/2006 N550 39.0 3.035 4267 0.300 Max., warm load!
11/22/2006   38.5 3.035 4235 0.290 Best load to date!
11/21/2006   38.0 3.035 4139 0.340 Quite windy, good powder!
"   37.0 3.035 4036 0.430  
             
11/10/2006 Big Game 38.5 3.035 4216 0.580 Max.
11/21/2006   38.0 3.035 4094 0.575 Quite windy
11/10/2006   37.5 3.035 4083 0.540 Good load
"   36.5 3.035 4006 0.435  
             
11/10/2006 N540 37.0 3.035 4427 0.495 Too HOT!
"   36.0 3.035 4045 0.780  
             
             
40 Vmax 11/22/2006 N550 38.5 3.010 4295 0.350 Excellent load
             
             
40 Nosler 11/21/2006 Big Game 38.0 3.040 4157 0.835 quite windy, good velocity
             
11/22/2006 N550 38.5 3.040 4304 0.790 Max.
             
             
38 Unmussig 1/24/2007 N550 39.3 3.035 4299 0.540 Max., but 25*, use 39.0
3/30/2007   39.0 3.035 4273 0.510 Good working load
1/17/2007   38.5 3.035 4137 0.580 Very cold, 10*, try 39.0
             
10/10/2007 Big Game 37.5 3.035 4094 0.455 No pressure
             
10/10/2007 Varget 36.0 3.035 4220 0.555 Max.

< Previous  Next >

Why the .20-250?
Why is flat trajectory so important?
Choosing an action, trigger and stock
Choosing a barrel
The scope
The Riflesmith
Loading dies & forming cases
Load work
Bullet performance issues
Final thoughts


Rocky Mountain Varmint Hunter


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